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buzzing sound @ valve but no water

Hi all,

I just moved into a house with an Irritrol system. It's my first time working with an irrigation system and I'm stumped.

I have figured the control unit out. When I set the Control unit to a specific zone (to test) I hear the valve softly buzzing, but no water is getting to the sprinkler heads. What do I troubleshoot next and how?

I have the exact same problem. I don't want to hijack the O.P.'s thread, but all of my valves hum and there is no water. I have a valve with a orange handle just off the valve box that I have turned parallel with the pipe. Right behind that is a pipe with a valve (similar to a hose hook-up, only it is upside down and where the H2O would come out it is sealed) that I have opened.